Restatement Of Condensed Consolidated Financial Statements (Condensed Consolidated Statements Of Changes In Stockholders' Equity) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 As previously reported	Jun. 30, 2012 As previously reported	Mar. 31, 2012 As previously reported	Dec. 31, 2011 As previously reported	Sep. 30, 2011 As previously reported	Jun. 30, 2011 As previously reported	Mar. 31, 2011 As previously reported	Dec. 31, 2010 As previously reported	Dec. 31, 2008 As previously reported	Sep. 30, 2012 Adjustment	Jun. 30, 2012 Adjustment	Mar. 31, 2012 Adjustment	Dec. 31, 2011 Adjustment	Sep. 30, 2011 Adjustment	Jun. 30, 2011 Adjustment	Mar. 31, 2011 Adjustment	Dec. 31, 2010 Adjustment	Dec. 31, 2009 Adjustment	Sep. 30, 2012 Restated	Jun. 30, 2012 Restated	Mar. 31, 2012 Restated	Dec. 31, 2011 Restated	Sep. 30, 2011 Restated	Jun. 30, 2011 Restated	Mar. 31, 2011 Restated	Dec. 31, 2010 Restated
Supplemental Financial Information [Line Items]
Common Stock	$ 760	$ 727		$ 730	$ 731	$ 731	$ 727	$ 728	$ 727	$ 727	$ 708		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0		$ 730	$ 731	$ 731	$ 727	$ 728	$ 727	$ 727	$ 708
Treasury Stock	(150)	(150)		(150)	(150)	(150)	(150)	(150)	(150)	(150)	(150)		0	0	0	0	0	0	0	0		(150)	(150)	(150)	(150)	(150)	(150)	(150)	(150)
Additional Paid-in Capital	1,372,378	1,369,471		1,371,389	1,371,059	1,370,335	1,369,471	1,368,864	1,368,202	1,367,509	1,343,639		0	0	0	0	0	0	0	0		1,371,389	1,371,059	1,370,335	1,369,471	1,368,864	1,368,202	1,367,509	1,343,639
Accumulated deficit	(1,584,222)	(1,220,984)		(1,189,620)	(1,225,389)	(1,137,700)	(1,197,884)	(728,602)	120,133	123,466	125,500		(23,100)	(23,100)	(23,100)	(23,100)	(20,864)	(20,864)	(20,864)	(20,864)		(1,212,720)	(1,248,489)	(1,160,800)	(1,220,984)	(749,466)	99,269	102,602	104,636
Accumulated other comprehensive income	14,325	32,550		28,438	17,493	57,686	35,162	13,089	228,099	197,671	63,499		(2,612)	(2,612)	(2,612)	(2,612)	(3,840)	4,134	2,088	1,565	1,565	25,826	14,881	55,074	32,550	9,249	232,233	199,759	65,064
Total	$ (196,909)	$ 181,614	$ 1,513,897	$ 210,787	$ 163,744	$ 290,902	$ 207,326	$ 653,929	$ 1,717,011	$ 1,689,223	$ 1,533,196	$ 1,685,162	$ (25,712)	$ (25,712)	$ (25,712)	$ (25,712)	$ (24,704)	$ (16,730)	$ (18,776)	$ (19,299)		$ 185,075	$ 138,032	$ 265,190	$ 181,614	$ 629,225	$ 1,700,281	$ 1,670,447	$ 1,513,897